ayoismeisalex
10.10.2021 •
Mathematics
Đối với người Việt Nam, lượng huyết sắc tố trung bình là 138,3g/l. Khám cho 80
công nhân ở nhà máy có tiếp xúc hóa chất thấy huyết sắc tố trung bình là 120g/l,
s = 15g/l. Từ kết quả trên có thể kết luận lượng huyết sắc tố trung bình của công
nhân nhà máy này thấp hơn mức chung hay không? (với mức ý nghĩa α = 0, 01)
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Ответ:
She earned $489.85-$388 extra= $101.85
She gets paid $9.7x1.5 for every extra hour=$14.55
She worked $101.85/$14.55 hours extra=7hours
She worked 7+40 hours that week=47 hours